I didn't read the whole article (It's a school day; I'm busy), but in my case, I have to disagree with your premise. LW has definitely been a net positive for me.

First, it has introduced me to different "tricks" for increasing productivity/doing what I want. Melatonin, knowledge of heuristics/biases, PUA/Ev Psych inspired social skills, etc.

Second, reading LW has directly contributed to me constructing an identity for myself that makes me more rational. If I identify myself as a rationalist, then my brain will act accordingly. This has been crucial in fighting akrasia.

Third, and perhaps most importantly, I know where my priorities lie. I post on LW irregularly, don't read every article - let alone most of the comments, and realize that LW is primarily "fun time." It's rationalist porn to some degree, and I'm ok with that. It certainly beats normal porn.

Am I atypical here on LW?